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	<title>YUI Library Examples: Button Control: Using the Button ARIA Plugin</title>
    

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    #button-example-form fieldset {
        border: 2px groove #ccc;
        margin: .5em;
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	/*
		The Menu ARIA Plugin removes the "href" attribute from the <A> element of each MenuItem
		if the value of the "href" is set to "#", resulting in the focus outline no longer be 
		rendered in Gecko-based browsers when the <A> element is focused.  For this reason, 
		it is necessary to restore the focus outline for the <A>. 
	*/
	a[role=menuitem]:focus {
		outline: dotted 1px #000;
	}
	
</style>

<script type="text/javascript" src="../container/assets/containerariaplugin.js"></script>
<script type="text/javascript" src="../menu/assets/menuariaplugin.js"></script>
<script type="text/javascript" src="../button/assets/buttonariaplugin.js"></script>

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//enable passthrough of errors from YUI Event:
if ((typeof YAHOO !== "undefined") && (YAHOO.util) && (YAHOO.util.Event)) {
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	<div id="pagetitle"><h1>YUI Library Examples: Button Control: Using the Button ARIA Plugin</h1></div>
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	<h1>Button Control: Using the Button ARIA Plugin</h1>
	
	<div class="exampleIntro">
	<p>
The Button ARIA Plugin makes it easy to use the 
<a href="http://www.w3.org/TR/wai-aria/">WAI-ARIA Roles and States</a> with the Button
and ButtonGroup controls.
Using the ARIA plugin, Buttons are more interoperable with assistive technologies (AT),
such as screen readers, making them more accessible to users with disabilities.
</p>
<p>
<a href="http://video.yahoo.com/watch/3608716/9955201">Watch a screen cast of this example 
running in Firefox 3 with the NVDA screen reader</a>, to see immediately the benefits that 
ARIA provides, or 
<a href="http://www.nvda-project.org/wiki/Snapshots">download the latest development snapshot of 
NVDA</a> to test this example for yourself.
</p>			
	</div>	
					
	<div class="example-container module ">
			<div class="hd exampleHd">
			<p class="newWindowButton yui-skin-sam"><!--<span id="newWindowLinkx"><span class="first-child">--><a href="button-ariaplugin_clean.html" target="_blank">View example in new window.</a><!--</span></span>-->		
		</div>		<div id="example-canvas" class="bd">
	
		
	<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
	
	<script type="text/javascript">

    (function () {
    	
    	var Event = YAHOO.util.Event,
    		Button = YAHOO.widget.Button,
    		UA = YAHOO.env.ua;

		Event.onContentReady("checkboxbutton-example", function () {		

			var oCheckButton1 = new Button("checkbutton1", { label: "Cheese" });
			var oCheckButton2 = new Button("checkbutton2", { label: "Mushrooms" });
			var oCheckButton3 = new Button("checkbutton3", { label: "Pepperoni" });
			var oCheckButton4 = new Button("checkbutton4", { label: "Olives" });
		
		});

		Event.onContentReady("radiobutton-example", function () {

			//	Only apply the WAI-ARIA Roles and States for FF 3 and IE 8 since those
			//	are the only browsers that currently support ARIA.
		
			if ((UA.gecko && UA.gecko >= 1.9) || (UA.ie && UA.ie >= 8)) {

				// Remove the "for" attribute in favor of using the aria-labelledby attribute
				YAHOO.util.Dom.get("buttongroup-label").removeAttribute(YAHOO.env.ua.ie ? "htmlFor" : "for");

			}

			var oButtonGroup = new YAHOO.widget.ButtonGroup("buttongroup", { labelledby: "buttongroup-label" });
		
		});

		Event.onContentReady("menubutton-example", function () {

			var oMenuButton = new Button("menubutton-1", { type: "menu", menu: "menubutton-1-menu" });
		
		});

		Event.onContentReady("splitbutton-example", function () {

			var oMenuButton = new Button("splitbutton-1", { type: "split", menu: "splitbutton-1-menu" });
		
		});

    }());

</script>

<form id="button-example-form" name="button-example-form" method="post">

	<fieldset id="checkboxbutton-example">
		<legend>Pizza Toppings</legend>

		<input id="checkbutton1" type="checkbox" name="checkboxfield1" value="1" checked>
		<input id="checkbutton2" type="checkbox" name="checkboxfield1" value="2">
		<input id="checkbutton3" type="checkbox" name="checkboxfield1" value="3">
		<input id="checkbutton4" type="checkbox" name="checkboxfield1" value="4">
		
	</fieldset>

	<fieldset id="radiobutton-example">
		<legend>Radio Buttons</legend>

		<div id="buttongroup" class="yui-buttongroup">
			<label for="radio1" id="buttongroup-label">Size</label>
			<input id="radio1" type="radio" name="radiofield1" value="Small" checked>
			<input id="radio2" type="radio" name="radiofield1" value="Medium">
			<input id="radio3" type="radio" name="radiofield1" value="Large">
		</div>		

	</fieldset>

	<fieldset id="menubutton-example">
		<legend>Menu Button</legend>
		<input type="button" id="menubutton-1" name="menubutton-1" value="Move To">
		<select id="menubutton-1-menu" name="menubutton-1-menu">
			<option value="0">Archive</option>
			<option value="1">Favorites</option>
			<option value="2">Trash</option>                
		</select>
	</fieldset>

	<fieldset id="splitbutton-example">
		<legend>Split Button</legend>	
		<input type="button" id="splitbutton-1" name="splitbutton-1" value="Reply">
		<select id="splitbutton-1-menu" name="splitbutton-1-menu">
			<option value="0">Reply To Sender</option>
			<option value="1">Reply To All</option> 
		</select>
	</fieldset>

</form>	
	<!--END SOURCE CODE FOR EXAMPLE =============================== -->
	
		
		</div>
		
	
	</div>			
	</div>
		
	<h2>Getting Started</h2>
<p>
Using the Button ARIA Plugin is easy.  Simply include the source file(s) for the ARIA plugin after 
the Button source files as indicated on the Button landing page.
</p>
<textarea name="code" class="HTML" cols="60" rows="1">
<!-- Source file -->
<script type="text/javascript" src="../button/assets/buttonariaplugin.js"></script>

<!-- OPTIONAL: Menu and Container ARIA Plugin files (required for creating Buttons of type "menu" and "split") -->
<script type="text/javascript" src="../container/assets/containerariaplugin.js"></script>
<script type="text/javascript" src="../menu/assets/menuariaplugin.js"></script>
</textarea>

<p>
All YUI ARIA Plugins require the user's browser and AT support the WAI-ARIA Roles and States.  
Currently only <a href="http://www.mozilla.com/en-US/firefox/">Firefox 3</a> and 
<a href="http://www.microsoft.com/windows/products/winfamily/ie/ie8/getitnow.mspx">Internet Explorer
8</a> have support for ARIA, and are supported by several screen readers for 
Windows that also offer support for ARIA.  For this reason the YUI ARIA Plugins are only enabled 
by default for these browsers.  To enable the ARIA plugin for other browsers, simply the set 
the <code>usearia</code> attribute to <code>true</code>.  For example:
</p>
<textarea name="code" class="JScript" cols="60" rows="1">
var oButton = new YAHOO.widget.Button({ 
	type: "checkbox",
	usearia: true,
	label: "A Checkbox", 
	name: "checkbox-1", 
	value: "1", 
	container: document.body });
</textarea>

<p>The same is true of the <code>ButtonGroup</code> widget:</p>
<textarea name="code" class="JScript" cols="60" rows="1">
var oButtonGroup = new YAHOO.widget.ButtonGroup({  
						name:  "radiogroup-1", 
						container:  document.body, 
						usearia: true });

oButtonGroup.addButtons([
	{ label: "Radio 1", value: "1" checked: true },
	{ label: "Radio 2", value: "2" }, 
	{ label: "Radio 3", value: "3" }, 
	{ label: "Radio 4", value: "4" }
]);
</textarea>

<h2>Plugin Features</h2>
<h3>More Accessible Radio Buttons and Checkboxes</h3>
<p>
All Buttons (with the exception of those of type <code>link</code>) created using the Button 
widget are represented in HTML using the <code>&#60;button&#62;</code> element.  While this element 
suits most applications, it doesn't convey the correct role information for Buttons of type
<code>checkbox</code> and <code>radio</code>.  For this reason the Button ARIA Plugin 
sets the ARIA <code>role</code> attribute of each Button to either <code>checkbox</code> and 
<code>radio</code>, and the ARIA <code>role</code> attribute for the root element of a 
ButtonGroup to 
<a href="http://www.w3.org/TR/wai-aria/#radiogroup"><code>radiogroup</code></a>.
Lastly, for Buttons of type
<code>checkbox</code> and <code>radio</code>, the Button ARIA Plugin automatically toggles the 
<a href="http://www.w3.org/TR/wai-aria/#checked"><code>aria-checked</code></a> attribute as the 
Button's <code>checked</code> attribute changes.
</p>

<h3>The <code>labelledby</code> and <code>describedby</code> Attributes.</h3>
<p>
The Button ARIA Plugin adds a <code>labelledby</code> and <code>describedby</code>
attribute to the ButtonGroup class, each of which maps back to their respective ARIA property of 
<a href="http://www.w3.org/TR/wai-aria/#labelledby"><code>aria-labelledby</code></a> and 
<a href="http://www.w3.org/TR/wai-aria/#describedby"><code>aria-describedby</code></a>.
</p>
<textarea name="code" class="JScript" cols="60" rows="1">
var oButtonGroup = new YAHOO.widget.ButtonGroup("buttongroup", { labelledby: "buttongroup-label" });
</textarea>

<h3>More Accessible Split Buttons and Menu Buttons</h3>
<p>
As indicated above, Buttons of type <code>menu</code> and <code>split</code> require the  
Container and Menu ARIA Plugins.  No additional configuration of a Button's Menu is required.  
Setting the <code>usearia</code> attribute to <code>true</code> for a Button will automatically set
the corresponding property on its Menu.  Additionally, the 
<a href="http://www.w3.org/TR/wai-aria/#haspopup"><code>aria-haspop</code></a> attribute
will automatically be set to <code>true</code> for each Button's <code>&#60;button&#62;</code> 
element so that users of AT know that the Button has a corresponding Menu.  The Menu's 
<code>labelledby</code> configuration property will automatically be set to the id of the 
Button, to further associate the Menu with its corresponding Button for users of AT.
</p>


<h2>Screen Reader Testing</h2>
<p>
Two of the leading screen readers for Windows, 
<a href="http://www.freedomscientific.com/fs_products/software_jaws.asp">JAWS</a> and 
<a href="http://www.gwmicro.com/Window-Eyes/">Window-Eyes</a>, support ARIA.  Free, trial 
versions of both are available for download, but require Windows be restarted every 40 minutes.
The open-source 
<a href="http://www.nvda-project.org/">NVDA Screen Reader</a> is the best option for developers as 
it is both free and provides excellent support for ARIA.
</p>
<h2>Configuration for This Example</h2>

<p>You can load the necessary JavaScript and CSS for this example from Yahoo's servers.  <a href="http://developer.yahoo.com/yui/articles/hosting/?menu&button&MIN#configure">Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured</a>.</p>

				</div>
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						<div id="loggerModule" class="yui-skin-sam">
						<h3 class="firstContent">YUI Logger Output:</h3>
								<div id="loggerGloss"><p><strong>Note:</strong> Logging and debugging is currently turned off for this example.</p> 
							<p class="loggerButton"><span id="loggerLink"><span class="first-child"><a href="button-ariaplugin_log.html">Reload with logging<br />
	 and debugging enabled.</a></span></span></p></div>
	
						</div>
					
				
					<div id="examples">
						<h3>Button Control Examples:</h3>
	
						<div id="exampleToc">
							<ul>
								<li><a href='../button/btn_example01.html'>Push Buttons</a></li><li><a href='../button/btn_example02.html'>Link Buttons</a></li><li><a href='../button/btn_example03.html'>Checkbox Buttons</a></li><li><a href='../button/btn_example04.html'>Radio Buttons</a></li><li><a href='../button/btn_example05.html'>Submit Buttons</a></li><li><a href='../button/btn_example06.html'>Reset Buttons</a></li><li><a href='../button/btn_example07.html'>Menu Buttons</a></li><li><a href='../button/btn_example08.html'>Split Buttons</a></li><li><a href='../button/btn_example09.html'>Simple Calendar Menu Button</a></li><li><a href='../button/btn_example10.html'>Calendar Menu Button with Date on Button Face</a></li><li><a href='../button/btn_example11.html'>Color Picker Button</a></li><li><a href='../button/btn_example12.html'>Fixed Width Menu Button</a></li><li><a href='../button/btn_example13.html'>Glowing Button</a></li><li><a href='../button/btn_example14.html'>Slider Button</a></li><li class='selected'><a href='../button/button-ariaplugin.html'>Using the Button ARIA Plugin</a></li><li><a href='../button/button-menu-select.html'>Using A Menu Button To Replace A &#60;select&#62; Element</a></li><li><a href='../button/button-menu-swap.html'>Replacing the content of a Button's Menu</a></li><li><a href='../autocomplete/ac_combobox.html'>Combobox, with CSS for Multiple Stacked Instances (included with examples for AutoComplete Control)</a></li><li><a href='../datatable/dt_colshowhide.html'>Showing, Hiding, and Reordering Columns. (included with examples for DataTable Control)</a></li><li><a href='../get/get-css-basic.html'>Getting CSS Style Sheets (included with examples for Get Utility)</a></li><li><a href='../layout/adv_layout.html'>Complex Application (included with examples for Layout Manager)</a></li>							</ul>
						</div>
					</div>
					
					<div id="module">
						<h3>More Button Control Resources:</h3>
						<ul>
							<li><a href="http://developer.yahoo.com/yui/button/">User's Guide</a> (external)</li>
						<li><a href="../../docs/module_button.html">API Documentation</a></li>
                            
                            
							<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/button.pdf">Cheat Sheet PDF</a> (external)</li></ul>
					</div>
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